Comment 4 for bug 1665014

@brian-murray: yes, thanks for requesting the details.

Following the directions in https://wiki.ubuntu.com/UbuntuImageUpdates for each of Yakkety and Xenial, I created the appropriate chroot, and installed ubuntu-image from -proposed. Then I used the command to build a bootable image, then outside the chroot I used qemu to boot the image. As per the exception plan, getting to the configuration screen is good enough for success (it proves the image boots).

Both validations were done for X and Y.